Red Shiso
Red Shiso is a Japanese heirloom herb with deep crimson foliage and a complex, spicy flavor profile that gardeners describe as a blend of cinnamon, clove, and cumin with hints of mint and basil. This frost-tender annual reaches 36 to 48 inches tall and produces a full canopy in just 80 to 89 days, thriving in full sun across hardiness zones 10 and 11. Beyond its culinary appeal, red shiso serves as an ornamental showstopper in the garden, offering multiple uses in Asian cooking, pickling, and traditional medicine that have made it a favorite among diverse growers.
Full Sun
Moderate
10-11
48in H x ?in W
Annual
High
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Red shiso's deep red leaves are as striking visually as they are flavorful, delivering that rare combination of ornamental drama and serious culinary purpose. The flavor is genuinely distinctive, a spicy warmth with cinnamon and clove undertones that separates it from common basil or mint. You can harvest young seedlings for salads within weeks or let the plant reach full maturity for more concentrated flavor and medicinal applications. It thrives in containers and loves bright sun, making it equally at home on a sunny windowsill as in the ground.
Red shiso is primarily used as a culinary herb in Japanese and other Asian cuisines. Fresh seedlings and young leaves work well tossed into salads, while mature leaves are commonly used in pickling recipes, where their deep color and spicy flavor add both visual appeal and distinctive taste. The herb also appears in traditional medicinal preparations, and its ornamental foliage makes it a dual-purpose plant for gardeners who value beauty alongside function.
Start seeds indoors in a seed tray 6 to 8 weeks before your last spring frost. Maintain soil temperature between 60 and 75 degrees Fahrenheit for reliable germination. Keep soil evenly moist but not waterlogged during the germination period.
Transplant seedlings outdoors after the last frost date when soil has warmed and plants have developed their first true leaves. Harden off seedlings by gradually exposing them to outdoor conditions over 7 to 10 days. Space transplants 12 inches apart in full sun.
Direct sow seeds outdoors after the last frost date when soil temperature reaches at least 60 degrees Fahrenheit. Sow seeds onto the soil surface or just barely covered, as they benefit from light exposure for germination.
Begin harvesting red shiso leaves once seedlings are established, typically within 4 to 6 weeks of planting. Pinch or cut individual leaves from the top of the plant as needed for fresh use in salads and cooking. For more dynamic culinary applications and maximum flavor concentration, allow plants to reach full maturity at 80 to 89 days before harvesting larger quantities. Young seedlings offer a tender, milder flavor, while mature plants develop the deeper spice and cinnamon notes that make this herb distinctive.
Pinch back growing tips regularly to encourage bushier, more compact growth and delay flowering. Remove flower spikes if you want to extend the leaf-harvesting season and maintain tenderness in the foliage. Regular harvesting of leaves naturally prunes the plant and stimulates fuller development.
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“Red shiso is a Japanese heirloom with deep roots in Asian culinary and medicinal traditions. Its botanical name, Perilla frutescens, reflects its wide cultivation across East Asia, where it has been grown for centuries as both a functional crop and ornamental plant. The variety persists today through seed savers and heirloom seed companies who recognize its cultural significance and unique properties, keeping this traditional plant available to gardeners seeking authentic Asian flavors and heritage genetics.”